Re: [time-nuts] Fw: Optical transfer of time and frequency

> > > - Original Message - > From: "Mark Sims" <hol...@hotmail.com> > To: <time-nuts@febo.com> > Sent: Wednesday, May 04, 2016 4:41 PM > Subject: [time-nuts] Fw: Optical transfer of time and frequency > > >>> See www.le

Re: [time-nuts] Fw: Optical transfer of time and frequency

ics. I know I'm not explaining this well enough, and it's a bit off-topic for this thread, but I'll write it up later and post it. /tvb - Original Message - From: "Mark Sims" <hol...@hotmail.com> To: <time-nuts@febo.com> Sent: Wednesday, May 04, 2016 4:41 PM Subject

[time-nuts] Fw: Optical transfer of time and frequency

> See www.leapsecond.com/tmp/5071a-12-run8-5d-10d.gif for a plot of a bunch of > 5071A Cs clocks. Interesting... what happened on day 4 to send them all bonkers? ___ time-nuts mailing list --

Re: [time-nuts] Fw: Optical transfer of time and frequency

dnesday, May 04, 2016 10:30 AM Subject: Re: [time-nuts] Fw: Optical transfer of time and frequency t...@leapsecond.com said: Any of these methods is going to be a challenge, given their 500 ps requirement and their $2k budget. How stable are surplus rubidium oscillators? How close could you g

Re: [time-nuts] Fw: Optical transfer of time and frequency

them to within > > 500 ps in order to adjust the timestamps in post-facto. > > > > /tvb > > > > - Original Message - > > From: "Hal Murray" <hmur...@megapathdsl.net> > > To: "Tom Van Baak" <t...@leapsecond.com>; "D

Re: [time-nuts] Fw: Optical transfer of time and frequency

ot; <t...@leapsecond.com>; "Discussion of precise time and > frequency measurement" <time-nuts@febo.com> Cc: <hmur...@megapathdsl.net> > Sent: Wednesday, May 04, 2016 10:30 AM > Subject: Re: [time-nuts] Fw: Optical transfer of time and frequency > > > t...

Re: [time-nuts] Fw: Optical transfer of time and frequency

l Message - From: "Hal Murray" <hmur...@megapathdsl.net> To: "Tom Van Baak" <t...@leapsecond.com>; "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Cc: <hmur...@megapathdsl.net> Sent: Wednesday, May 04, 2016 10:30 AM Subj

Re: [time-nuts] Fw: Optical transfer of time and frequency

- From: "Azelio Boriani" <azelio.bori...@gmail.com> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Monday, May 02, 2016 5:20 AM Subject: Re: [time-nuts] Fw: Optical transfer of time and frequency If every station has it

Re: [time-nuts] Fw: Optical transfer of time and frequency

t...@leapsecond.com said: > Any of these methods is going to be a challenge, given their 500 ps > requirement and their $2k budget. How stable are surplus rubidium oscillators? How close could you get if you brought two of them together, compared phase, drove them to the site for a nights

Re: [time-nuts] Fw: Optical transfer of time and frequency

From: "Azelio Boriani" <azelio.bori...@gmail.com> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Monday, May 02, 2016 5:20 AM Subject: Re: [time-nuts] Fw: Optical transfer of time and frequency > If every station has its own

Re: [time-nuts] Fw: Optical transfer of time and frequency

If the dynamics is working for you, yes, you can use something like that. If you have noise, you would like a spreading code such that the correlation in the receiver suppress the noise. MVH Magnus On 05/02/2016 11:14 AM, Michael Wouters wrote: One other possibility occurs to me that might

Re: [time-nuts] Fw: Optical transfer of time and frequency

One other possibility occurs to me that might be doable with surplus gear and sticks to the budget. Instead of using WR, give up on getting time of day and just send a 1 kHz pulse stream in each direction. Each station then measures against its own GPSDO clock using a standard/homebrew TIC and

Re: [time-nuts] Fw: Optical transfer of time and frequency

Javier, On 05/01/2016 02:54 PM, Javier Serrano wrote: On Sun, May 1, 2016 at 9:50 AM, Magnus Danielson wrote: If I recall correctly, there where some White Rabbit stuff available from vendors, was it only Ethernet switches or also cards? Yes, the switch is

Re: [time-nuts] Fw: Optical transfer of time and frequency

On Sun, May 1, 2016 at 5:44 PM, Tom Van Baak wrote: > This particular issue -- how to synchronize (or, at least phase compare) > multiple oscillators by a two-way laser link over a few km to within 500 ps > -- is really quite interesting. It would, for example, allow me to

Re: [time-nuts] Fw: Optical transfer of time and frequency

> Has anybody experienced with free-space optical gigabit Ethernet > links? I am curious about whether the transceivers have a fixed > latency or at least a latency one can easily quantify online. This is > the trickiest part for adding WR support on top of a given physical > layer. Hi Javier,

Re: [time-nuts] Fw: Optical transfer of time and frequency

On Sun, May 1, 2016 at 9:50 AM, Magnus Danielson wrote: > If I recall correctly, there where some White Rabbit stuff available from > vendors, was it only Ethernet switches or also cards? Yes, the switch is available from two vendors that I know of. They are

Re: [time-nuts] Fw: Optical transfer of time and frequency

Javier, If I recall correctly, there where some White Rabbit stuff available from vendors, was it only Ethernet switches or also cards? Cheers, Magnus On 05/01/2016 01:14 AM, Bruce Griffiths wrote: On Sunday, 1 May 2016 10:52 AM, Bruce Griffiths wrote:

[time-nuts] Fw: Optical transfer of time and frequency

On Sunday, 1 May 2016 10:52 AM, Bruce Griffiths wrote: White Rabbit is open hardware, you are free to build it yourself should you want to do so. All the relevant VHDL etc is available.There will also be suitable TDC designs available on the CERN site.You